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. 2021 Jun 17;11:12779. doi: 10.1038/s41598-021-92267-z

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Aerial view of the layer farm, with the free-range study area (A) directly connected to the poultry house (C), and the surrounding grass pastures (B) that formed the total surface of the free-range area (A + B). The red line marks the fence. The area within the yellow line (B) is the range of the laser during daylight laser beaming. The area within the red line (A) is the range of the laser during night laser beaming. The red star (upper right corner in area A) indicates the position of the laser. The blue stars in area A indicate the position of the wide-angle video-cameras. The farm house is indicated by D (source: Google Earth, 2021 Google).